System to prevent leaks of liquids in manual sprayers

Abstract

System to prevent leaks of liquids in a manual sprayer—insecticides, herbicides, fungicides—comprised by a large storing tank in which a recipient is installed under pressure. A pumping assembly, which is manually activated, is connected to the inferior part of the container under pressure and to the lower part of the tank. The pumping assembly is comprised of an alternative piston to extract the liquid from the storing tank and to pressurize it inside the container under pressure. The pressurized liquid is applied using a hose and a regulating valve attached to the container under pressure. The pumping ensemble is comprised as well by a double-walled piston and a barrier against leaks of the piston, formed by a flexible sealing accordion with four lobes or waves that avoid grazing the cylinder and that prevent leaking from taking place between the superior side of the piston and the inferior side of the piston chamber, thus blocking the exit of liquid and forcing it to stay at the collection chamber until it is once again emptied thanks to the descending movement of the piston. The liquid is therefore taken back from the collection chamber to the storing tank by means of a returning hose, of an internal duct and of a siphon that unloads above the liquid level.

Dependencies are inferred from the claim text.